J.W.
I think my husband has this XYY syndrome because what Annie said about it, it sounds just like the problems he has sometimes. It has never been diagnosed as this but he does have learning disabilities, problems with language and finding the right words, as well as trouble spelling sometimes. He's very tall (even though most of his family is not really super tall). My husband does have a bad temper sometimes and doesn't like to feel anxiety or frustration because this tends to fuel the anger worse than anything else but he is in no way criminal. He's never been in trouble with the law! I'm basically writing to tell you not to worry. If my husband does have this same thing (and I really think he does), your son will be fine. My husband is a high school and college graduate and we have a great and happy marriage. He's an excellent father and instead of his learning disabilities discouraging him from learning it has seemed to fuel his need to learn. He is always trying to learn new things. Just be there for him and help him the best you can without doing everything for him. Good luck!